Add 12/7 and 30/40
1st number: 1 5/7, 2nd number: 30/40
12/7 + 30/40 is 69/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
12/7 = 12 × 40/7 × 40 = 480/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
30/40 = 30 × 7/40 × 7 = 210/280 - Add the two like fractions:
480/280 + 210/280 = 480 + 210/280 = 690/280 - 690/280 simplified gives 69/28
- So, 12/7 + 30/40 = 69/28
In mixed form: 213/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/7+30/40 12/7+60/40 12/14+30/40 12/7+30/80 36/7+30/40 12/7+90/40 12/21+30/40 60/7+30/40 12/35+30/40 84/7+30/40 12/49+30/40